The Wilson 12 Fast Pitch Softball is designed for High School and Adult play. SSTtm Super Seam technology is Patented. 20% higher than conventional raised seams gives pitchers superior control on the mound and helps fielders locate the ball quicker in the glove and throw with more accuracy. Frequency matched Optic Yellow tm Leather softballs with red stitches have a specially formulated coating to give maximum brightness and residual tack. The center is 375 lbs. Compression controled polycore which do not break down as quickly during play as cork softballs, making them the most consistent playing softballs available.COR .47 max. Comp. 375 lbs. max.